What is a characteristic of multi-hole type nozzles?

Multi-hole type nozzles are designed to provide a wider spray pattern, which enhances the atomization and mixing of fuel with air in the combustion chamber. This wider spray pattern allows for better fuel distribution and more efficient combustion, resulting in improved engine performance, especially in modern high-speed diesel engines. The design of multiple holes enhances the fuel breakup and dispersion, leading to a finer and more uniform mist of fuel being injected.

The other characteristics are generally not true. While some nozzles may exhibit cleaning features, this is not a defining characteristic of multi-hole nozzles. Multi-hole designs are not limited to older engines; they are frequently used in contemporary applications. Additionally, they typically operate effectively at a range of pressures rather than necessarily at lower pressures. The key aspect of multi-hole nozzles is indeed their ability to create a wider spray pattern, which is essential for optimizing combustion efficiency.